John g



{No Model.)

J. G. GERMANN & P. B. DOWNING.

DYNAMO ELECTRIC MACHINE AND ELEGTRIG MOTOR.

No. 562,179. Patented June 16, 1896.

g a W WITNESSES: m VEN 70/? 5 W B) jW W ATTORNEYS UNITED STATES PATENTOFFICE.

JOHN G. GERMANN AND FREDERICK B. DOXVNING, OF ERIE, PENNSYLVANIA; SAIDGERMANN ASSIGNOR TO SAID DOIVNING.

DYNAMO-ELECTRlC MACHINE AND ELECTRIC MOTOR.

SPECIFICATION forming part of Letters Patent No. 562,17 9, dated June16, 1896.

Application filed March 26, 1896.

T0 aZZ whom it may concern.-

Be it known that we, JOHN G. GERMANN and FREDERICK B. DowNINe, citizensof the United States, residing at Erie, in the county of Erie and Stateof Pennsylvania, have invented certain new and useful Improvements inElectric Dynamos and Motors; and we do hereby declare the following tobe a full, clear, and exact description of the invention, such as willenable others skilled in the art to which it appertains to make and usethe same.

This invent-ion relates to frames for electric motors and dynamos; andit consists in certain improvements in the construction there-- of, aswill be hereinafter fully described, and pointed out in the claims.

The invention is illustrated in the accompanying drawings, as follows:

Figure 1 shows an elevation of a frame of our construction. Fig. 2 is aplan View of the same.

A marks the base of the machine, B B hinged field-magnet-core-carryingplates, and G a connecting-plate which as here shown forms the top plateof the frame. The dotted line indicates the path of the armature,adjacent to which are the field-shoes A, B, and O, which extend from theseveral field-magnet cores of the field-coils a, Z), Z), (not shown,)and 0, respectively. The hinged field-magnet-core-carryin g plates 13are normally bolted into the machine, as shown, at the right of thefigure, thus forming a rigid member of the frame. In the constructionhere shown the top plate, base and hinged plates are provided with theperforated ears 0 and b at the edges through which are passed bolts 1).

\Vhen the coil Z) burns out or for other cause needs repair, the boltsZ) at one side of the frame are removed and the bolts securing the sameplate at the opposite side slightly loosened, thus forming a hinge. Theplate with the field-magnet core and coil is then swung out, thusexposing the different parts, so that if desired the shoe 13 mayberemoved and the spool b replaced.

At the left of the figures the hinged plate B is shown swung out, theshoe and spool be- Serial No. 584,993. (No model.)

ing removed, exposing the core 13 which is preferably cast with thehinged plate 13.

It will be noted that the hinges formed by the ears 0', b and bolt 1)are at the sides of the frame, so that all parts of the shoe recede fromthe armature with the first outward movement of the plate. If the platewere hinged at a point in a line perpendicular to the face of the shoeat the center of the shoe, this swinging out of the field-magnet coreand coil could not be effected without placing the field-shoe at agreater distance from the armature than is desirable, because the lengthof the radial line from the edges of the shoe to the hinge would begreater than the distance from the hinge to the armature. IVe thereforehinge the plate off the center of the shoe sufficiently to bring everypoint of the shoe as far from the hinge as the armature is at thenearest point by which the respective points of the shoe pass as theshoe is swung out. These hinged plates may be variously located,especially as the poles are increased and the method of hinging may alsobe changed, but in all constructions the axis of the hinge should be ina plane substantially at right angle to the axis of the armature. Thisallows the field-magnet core and coil to swing out sidewise, thusrequiring but a small opening in the frame through which to swing, andalso permits of a simple and strong structure for the frame. \Ve prefer,however, the construction shown.

IVhat we claim as new is- 1. In a motor or dynamo, the combination withthe armature; of the field-magnet core having its shoe in properrelation to the armature; and a support for said field-magnet corehinged off the center of said shoe to allow the free movement of thefield-magnet core and coil away from the armature, and having the axisof the hinge in a plane substantially at right angles to the axis of thearmature.

2. In a motor or dynamo, the combination with the armature; of the framecomposed of the members A and O and the members B B between the membersA and 0; bolts securing the members together, one or more of said boltsbeing so located With relation to each In testimony whereof we affix oursignamember B as to form ahing'e for said member tures in presence oftwo Witnesses.

when loosened with the axis of said hing-e in JOHN G. GERMANN.

a plane at substantially right angles to the FREDERICK B. DO WNING.armature; and a field-magnet core supported Vitnesses:

by each member B With its face center at one CHAS. M. VARNER,

side of the hinge. II. C. LORD.

